chore: rename `s` to `tau` for trusted setup secret #329

Job	Run time
Build - x86_64-unknown-linux-gnu	1m 20s
Build - aarch64-unknown-linux-gnu	1m 18s
Build - aarch64-apple-darwin	1m 12s
Build - x86_64-apple-darwin	1m 20s
Build - x86_64-pc-windows-gnu	2m 55s
Test - x86_64-unknown-linux-gnu	36s
Test - aarch64-unknown-linux-gnu	49s
Test - x86_64-apple-darwin	57s
Test - aarch64-apple-darwin	46s
Test - x86_64-pc-windows-gnu	1m 38s
Publish	0s
	12m 51s

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